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A marine biologist uses Maps to explore under the sea

Using Google Maps’ satellite view, Johnny spotted perfect circles along the reef, indicating a potential blue hole. These rare underwater sinkholes offer vital information about life in the ocean. 

Once they navigated to where they thought the blue hole was, Johnny dove in.  

Underwater were healthy coral formations.

Home to over 400 species of hard coral, like these, the Great Barrier Reef is the largest living structure on earth.

Scientists use the layers of sediment that collect at the bottom of blue holes to learn information about conditions in the past.

 Blue holes are biodiversity hotspots. Here, fish swim around the bright yellow coral. 

Johnny captured images of the blue hole to help create a snapshot of reef conditions. 

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